"At the center of our society is going to be a simple promise to every American, and it's called safety. ... We must work with our police, not against our police. They are great people and do a great job," said Trump.

Fresh on many voters minds is the unrest in Charlotte, and tense relationship between minority communities and the police that serve them.

"Safety, safety, we need to be safe, we need to feel safe," said Dominique Ryan of Garnet Valley, Pennsylvania.

"I'm a veteran, and with all the stuff going on in the country, he's the guy, he's going to be the law enforcement guy," said Barry Martin of Eagleville, Pennsylvania.

"I would have liked to have heard a little bit more about some of the police brutality going on in the nation right now. I think it's a really pressing issue," said Tre Armstrong of Bear, Delaware.

Thousands of people packed Sun Center Studios for Trump's second visit this month to Aston.

With 20 electoral votes up for grabs, Trump's focused on the battleground state's middle-class living outside the city.

"I think it's the greatest energy I've ever seen. I've never seen a politician be able to bring out this big a crowd, and make people my age this interested in politics," said Brett Nordmeyer of Wilmington.

Not everyone was sold by his message.

Our cameras caught a handful of disruptive attendees escorted out.

Still, his message caught the ears of some swing voters.

"I came here not really a Trump supporter, but just seeing the whole atmosphere really opened my eyes. I wouldn't say I left a Trump supporter, but I really did enjoy his speech," said Armstrong.

Some organizers say 57,000 volunteers will be canvasing Philadelphia's suburbs this weekend. The last time the state went red was in 1988.